Port security feature
Jun 22,95All interfaces on a Cisco switch are turned on by default. This means that an attacker could connect his laptop …
Read MoreHow switches forward frames
Jun 21,95When a frame arrives at a switch interface, the switch looks for the destination hardware (MAC) address in its MAC …
Read MoreHow switches learn MAC addresses
Jun 20,95As you probably already know, each network card has a unique identifier called Media Access Control (MAC) address. MAC addresses …
Read MoreLayer 2 switching
Jun 19,95Layer 2 switching (also known as the Data Link layer switching) is the process of using devices’ MAC addresses to …
Read MoreOSPF route summarization
Jun 18,95Unlike EIGRP, OSPF doesn’t support automatic summarization. Also, unlike EIGRP, where you can summarize routes on every router in an …
Read MoreOSPF MD5 authentication
Jun 15,95The OSPF MD5 authentication is more secure than the plain text authentication. This method uses the MD5 algorithm to compute …
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